Extrinsic design of high-performance programmable supercapacitor with large specific areal capacitance
ELECTROCHIMICA ACTA(2023)
摘要
The stretchable supercapacitors based on predesigned structures show low specific areal capacitance and lack programmable stretchability. To overcome the limitations, developing a programmable supercapacitor with customizable stretchability and ultrahigh areal capacitance is extremely desirable. In this study, we develop programmable supercapacitors with desirable stretchability and ultrahigh specific capacitance using inter-connected polypyrrole/graphene (PPy/RGO) electrodes. Thanks to the easy accessibility of ions and high ability of ion transfer, the optimized PPy/RGO-1800 electrode achieves a specific capacitance of 1545.6 mF & BULL;cm 2, and the assembled flexible supercapacitor presents an ultrahigh stack capacitance of 45.1 F & BULL;cm 3. The stretchable supercapacitor edited by kirigami delivers a specific capacitance of 489.1 mF & BULL;cm 2 at 400% strain and keeps stable capacitive performance under various deformations (bending, stretching and torsion), which is superior to most of the reported stretchable supercapacitors. Additionally, it can keep more than 92% of initial capacitance after 1000 cycles of various large deformations. The enhanced areal capacitance and easy programmability make the stretchable supercapacitor highly promising for wearable electronics.
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关键词
programmable supercapacitor,high-performance
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